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6465928921 = 19124212
BaseRepresentation
bin1100000010110011…
…00011111011011001
3121200121210012222221
412001121203323121
5101220234211141
62545335144041
7316142326504
oct60131437331
917617705887
106465928921
112818937111
121305515021
137c0781b5a
14454a5613b
1527c9c0bd1
hex181663ed9

6465928921 has 9 divisors (see below), whose sum is σ = 6515435199. Its totient is φ = 6416797800.

The previous prime is 6465928919. The next prime is 6465928949. The reversal of 6465928921 is 1298295646.

The square root of 6465928921 is 80411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 30680521 + 6435248400 = 5539^2 + 80220^2 .

It is not a de Polignac number, because 6465928921 - 21 = 6465928919 is a prime.

It is a super-2 number, since 2×64659289212 = 83616473622848448482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6465928991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15358291 + ... + 15358711.

Almost surely, 26465928921 is an apocalyptic number.

6465928921 is the 80411-st square number.

6465928921 is the 40206-th centered octagonal number.

It is an amenable number.

6465928921 is a deficient number, since it is larger than the sum of its proper divisors (49506278).

6465928921 is an frugal number, since it uses more digits than its factorization.

6465928921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224 (or 612 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The cubic root of 6465928921 is about 1862.9890776687.

It can be divided in two parts, 6465928 and 921, that added together give a square (6466849 = 25432).

The spelling of 6465928921 in words is "six billion, four hundred sixty-five million, nine hundred twenty-eight thousand, nine hundred twenty-one".

Divisors: 1 191 421 36481 80411 177241 15358501 33853031 6465928921